#include <math.h>
#include <stdio.h>

int main(void)
{
  const double ANSWER = 3.14159;
  double response;

  printf("What is the value of pi?\n"); 
  scanf("%lf",&response);

  while(fabs(response-ANSWER) > 0.0001)
  {
    printf("Try again!\n");
    scanf("%lf",&response);
  }
  printf("Close enough!\n");
  return 0;
}